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Subject[PATCH v6 12/14] soc: mediatek: Add extra sram control
Date
For some power domains like vpu_core on MT8183 whose sram need to
do clock and internal isolation while power on/off sram.
We add a flag "sram_iso_ctrl" in scp_domain_data to judge if we
need to do the extra sram isolation control or not.

Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
---
drivers/soc/mediatek/mtk-scpsys.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index 74fd981..d3fdb3f 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -57,6 +57,8 @@
#define PWR_ON_BIT BIT(2)
#define PWR_ON_2ND_BIT BIT(3)
#define PWR_CLK_DIS_BIT BIT(4)
+#define PWR_SRAM_CLKISO_BIT BIT(5)
+#define PWR_SRAM_ISOINT_B_BIT BIT(6)

#define PWR_STATUS_CONN BIT(1)
#define PWR_STATUS_DISP BIT(3)
@@ -115,6 +117,8 @@ enum clk_id {
* @name: The domain name.
* @sta_mask: The mask for power on/off status bit.
* @ctl_offs: The offset for main power control register.
+ * @sram_iso_ctrl: The flag to judge if the power domain need to do
+ * the extra sram isolation control.
* @sram_pdn_bits: The mask for sram power control bits.
* @sram_pdn_ack_bits: The mask for sram power control acked bits.
* @bus_prot_mask: The mask for single step bus protection.
@@ -130,6 +134,7 @@ struct scp_domain_data {
const char *name;
u32 sta_mask;
int ctl_offs;
+ bool sram_iso_ctrl;
u32 sram_pdn_bits;
u32 sram_pdn_ack_bits;
u32 bus_prot_mask;
@@ -268,6 +273,14 @@ static int scpsys_sram_enable(struct scp_domain *scpd, void __iomem *ctl_addr)
return ret;
}

+ if (scpd->data->sram_iso_ctrl) {
+ val = readl(ctl_addr) | PWR_SRAM_ISOINT_B_BIT;
+ writel(val, ctl_addr);
+ udelay(1);
+ val &= ~PWR_SRAM_CLKISO_BIT;
+ writel(val, ctl_addr);
+ }
+
return 0;
}

@@ -277,6 +290,15 @@ static int scpsys_sram_disable(struct scp_domain *scpd, void __iomem *ctl_addr)
u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
int tmp;

+ if (scpd->data->sram_iso_ctrl) {
+ val = readl(ctl_addr);
+ val |= PWR_SRAM_CLKISO_BIT;
+ writel(val, ctl_addr);
+ val &= ~PWR_SRAM_ISOINT_B_BIT;
+ writel(val, ctl_addr);
+ udelay(1);
+ }
+
val = readl(ctl_addr) | scpd->data->sram_pdn_bits;
writel(val, ctl_addr);

--
1.8.1.1.dirty
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